小管径-粒径比颗粒无序堆积通道内壁面效应数值研究

doi:10.11949/j.issn.0438-1157.20170513

化工学报 ›› 2017, Vol. 68 ›› Issue (S1): 54-59.DOI: 10.11949/j.issn.0438-1157.20170513

小管径-粒径比颗粒无序堆积通道内壁面效应数值研究

胡映学, 周浪, 杨剑, 王秋旺

西安交通大学热流科学与工程教育部重点实验室, 陕西西安 710049

收稿日期:2017-05-02 修回日期:2017-05-09 出版日期:2017-08-31 发布日期:2017-08-31
通讯作者: 杨剑,yangjian81@mail.xjtu.edu.cn
基金资助:
国家自然科学基金项目（51476124，51536007）。

Numerical simulation of wall effect in randomly packed bed with low tube to particle diameter ratio

HU Yingxue, ZHOU Lang, YANG Jian, WANG Qiuwang

Key Laboratory of Thermal-fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China

Received:2017-05-02 Revised:2017-05-09 Online:2017-08-31 Published:2017-08-31
Supported by:
supported by the National Natural Science Foundation of China (51476124,51536007).

摘要/Abstract

摘要：

采用DEM-CFD方法对小管径-粒径比颗粒无序堆积通道内壁面效应进行了数值研究。针对D/d_p=5.0圆球无序堆积通道构建了光滑壁面和波节壁面两种通道壁面结构，分析了不同壁面结构堆积通道内孔隙率分布、流动和温度场分布及其流动换热性能。结果表明：小管径-粒径比光滑壁面颗粒无序堆积通道内壁面效应显著，壁面附近平均流速明显高于堆积中心区域，而平均温度要低于堆积中心区域，壁面附近0.5d_p区域内通过的流体质量流量比例为46%；波节壁面结构抑制了通道壁面附近漏流，可小幅提高堆积通道的换热能力，但堆积通道内的流动阻力也随之增大，其综合换热性能较光滑壁面堆积通道有所下降。

关键词: 颗粒无序堆积, 离散元, 壁面效应, 流动, 传热, 数值模拟

Abstract:

The wall effect in randomly packed bed with low tube to particle ratio is numerically investigated by coupling discrete element method (DEM) and computational fluid dynamics (CFD). The porosity,characteristics of fluid flow and heat transfer in randomly packed beds are carefully studied,including smooth tube wall model and corrugated tube wall model. Simulation results show that,the wall effect in smooth wall packing with low tube to particle diameter ratio is remarkable. The average velocity of the near tube wall region is higher than inner region,while the average temperature of this region is lower. Besides,the mass flow rate in the range of 0.5d_p near the tube wall is about 46% of the total flow. With corrugated structure,the leakage near the tube wall is suppressed and the mass flow rate decreases to 36%. The heat transfer characteristics and drag coefficient have a slight increase,while the overall heat transfer coefficient is lower than smooth tube wall model.

Key words: randomly packed bed, DEM, wall effect, flow, heat transfer, numerical simulation

中图分类号:

TK124

胡映学, 周浪, 杨剑, 王秋旺. 小管径-粒径比颗粒无序堆积通道内壁面效应数值研究[J]. 化工学报, 2017, 68(S1): 54-59.

HU Yingxue, ZHOU Lang, YANG Jian, WANG Qiuwang. Numerical simulation of wall effect in randomly packed bed with low tube to particle diameter ratio[J]. CIESC Journal, 2017, 68(S1): 54-59.

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小管径-粒径比颗粒无序堆积通道内壁面效应数值研究

Numerical simulation of wall effect in randomly packed bed with low tube to particle diameter ratio

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